---
metadata:
  title: CIPM, 1946
  date: '1946-01-01'
  source: BIPM - Pavillon de Breteuil
resolutions:
- dates:
  - '1946-01-01'
  title: Definition of photometric units
  identifier: 0
  url: https://www.bipm.org/en/CIPM/db/1946/0/
  approvals:
  - type: affirmative
    degree: unanimous
    message: Unanimous
  considerations: []
  actions:
  - type: decides
    date_effective: '1946-01-01'
    message: |-
      +

      ...

      [start=4]
      . The photometric units may be defined as follows:
  - type: decides
    date_effective: '1946-01-01'
    message: New candle (unit of luminous intensity) - The value of the new candle
      is such that the brightness of the full radiator at the temperature of solidification
      of platinum is 60 new candles per square centimetre.
  - type: decides
    date_effective: '1946-01-01'
    message: |-
      New lumen (unit of luminous flux) - The new lumen is the luminous flux emitted in unit solid angle (steradian) by a uniform point source having a luminous intensity of 1 new candle.

      [start=5]
      . ...
- dates:
  - '1946-01-01'
  title: Definitions of electric units
  identifier: 2
  url: https://www.bipm.org/en/CIPM/db/1946/2/
  approvals:
  - type: affirmative
    degree: unanimous
    message: Unanimous
  considerations: []
  actions:
  - type: decides
    date_effective: '1946-01-01'
    message: |-
      +

      ...

      [start=4]
      . stem:[("A")] Definitions of the mechanical units which enter the definitions of electric units:
  - type: decides
    date_effective: '1946-01-01'
    message: Unit of force - The unit of force [in the MKS (metre, kilogram, second)
      system] is the force which gives to a mass of 1 kilogram an acceleration of
      1 metre per second, per second.
  - type: decides
    date_effective: '1946-01-01'
    message: Joule (unit of energy or work) - The joule is the work done when the
      point of application of 1 MKS unit of force [newton] moves a distance of 1 metre
      in the direction of the force.
  - type: decides
    date_effective: '1946-01-01'
    message: |-
      Watt (unit of power) - The watt is the power which in one second gives rise to energy of 1 joule.

      (B) Definitions of electric units. The Comité International des Poids et Mesures (CIPM) accepts the following propositions which define the theoretical value of the electric units:
  - type: decides
    date_effective: '1946-01-01'
    message: Ampere (unit of electric current) - The ampere is that constant current
      which, if maintained in two straight parallel conductors of infinite length,
      of negligible circular cross-section, and placed 1 metre apart in vacuum, would
      produce between these conductors a force equal to stem:[2 * 10^(-7)] MKS unit
      of force [newton] per metre of length.
  - type: decides
    date_effective: '1946-01-01'
    message: Volt (unit of potential difference and of electromotive force) - The
      volt is the potential difference between two points of a conducting wire carrying
      a constant current of 1 ampere, when the power dissipated between these points
      is equal to 1 watt.
  - type: decides
    date_effective: '1946-01-01'
    message: Ohm (unit of electric resistance) - The ohm is the electric resistance
      between two points of a conductor when a constant potential difference of 1
      volt, applied to these points, produces in the conductor a current of 1 ampere,
      the conductor not being the seat of any electromotive force.
  - type: decides
    date_effective: '1946-01-01'
    message: Coulomb (unit of quantity of electricity) - The coulomb is the quantity
      of electricity carried in 1 second by a current of 1 ampere.
  - type: decides
    date_effective: '1946-01-01'
    message: Farad (unit of capacitance) - The farad is the capacitance of a capacitor
      between the plates of which there appears a potential difference of 1 volt when
      it is charged by a quantity of electricity of 1 coulomb.
  - type: decides
    date_effective: '1946-01-01'
    message: Henry (unit of electric inductance) - The henry is the inductance of
      a closed circuit in which an electromotive force of 1 volt is produced when
      the electric current in the circuit varies uniformly at the rate of 1 ampere
      per second.
  - type: decides
    date_effective: '1946-01-01'
    message: Weber (unit of magnetic flux) - The weber is the magnetic flux which,
      linking a circuit of one turn, would produce in it an electromotive force of
      1 volt if it were reduced to zero at a uniform rate in 1 second.